Effect of selenium doping on the superconductivity of Nb2Pd(S1−xSex)5
C. Q. Niu, J. H. Yang, Y. K. Li, Bin Chen, N. Zhou, J. Chen, L. L. Jiang, B. Chen, X. X. Yang, Chao Cao, Jianhui Dai, Xiaofeng Xu
DOI 10.1103/PhysRevB.88.104507 · Physical Review B
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Abstract
We study the isovalent substitution effect by partially introducing Se on the S site in the newly discovered superconductor Nb2PdS5 (Tc∼ 6 K) whose upper critical field is found to be far above its Pauli paramagnetic limit. In this Nb2Pd(S1−xSex)5 (0 ≤ x ≤ 0.8) system, superconductivity is systematically suppressed by the Se concentration and ultimately disappears when x≥ 0.5, after which a semiconductinglike ground state emerges. In spite of the considerably reduced Tc with Se doping, the ratio of the upper critical field Hc2 to Tc remains unaffected. Moreover, the size of the heat capacity jump at Tc is smaller than that expected for a BCS superconductor, implying that a strong-coupling theory cannot be the origin of this large upper critical field. In addition, the low-lying quasiparticle excitations are consistent with a nodeless gap opening over the Fermi surface. These results combined impose severe constraints on any theory of exotic superconductivity in this system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb2Pd(S1-xSex)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | unknown |
| Nb2PdS5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.3 | Pressure not reported | onset |
| Nb2PdS5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | unknown |
| Nb2Pd0.81S5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.6 | Pressure not reported | unknown |
| LaFeAsO0.89F0.11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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